eccentric action

eccentric action

active resistance by a muscle to lengthening, e.g. that of quadriceps during controlled descent of a hill or stairs. Also referred to, paradoxically and unwisely, as 'eccentric contraction' or even 'lengthening contraction'. Unlike a spring in the equivalent situation, a muscle expends energy even during such passive extension, as both excitation and cross-bridge cycling must continue, although this is a fraction of the energy cost of concentric actions generating the same force at the same absolute velocity. eccentric exercise involves the principal muscles in eccentric action. Because most (though not all) muscles can produce higher forces in this mode of action than in isometric or concentric exercise, greater training effects are widely considered to result, though greater muscle damage and delayed-onset muscle soreness (DOMS) may ensue in unaccustomed subjects. See alsoforce-velocity relationship, muscle contraction, work.

30 /PRNewswire/ -- Eidos Interactive, one of the world's leading publishers and developers of entertainment software, today confirms MONSTER LAB, an eccentric action and role playing game (RPG) for Wii(TM) and Nintendo DS(TM)

22 rifle boasts new and innovative features including a Mauser-type claw extractor for controlled-round feeding, a two-position Model 70-type safety, and an eccentric action in which the bolt raceway is slightly above center in the receiver.

Thereby, we designed the present study to compare the maximal strength and EMG in response to prolonged vibration stimulation during maximal eccentric action and maximal concentric action for evaluation of the alpha motor neuron activity.

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